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Control surfaces such as ailerons and elevators are usually mounted so that they are

  • A.Aerodynamically and mass balanced to avoid flutter
  • B.As heavy as possible at the trailing edge
  • C.Rigidly fixed to the main structure
  • D.Free to move without any hinge moment

Answer: A

Placing part of the surface ahead of the hinge line reduces the hinge moment, and adding mass ahead of it moves the centre of gravity forward so that bending and rotation do not couple. Both measures raise the flutter speed, and mass balance in particular is a certification requirement.

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